可捕获的致命错误:类PDOStatement的对象不能转换为第114行中的字符串。

I'm trying to add some data to my database, but I'm getting the error Catchable fatal error: Object of class PDOStatement could not be converted to string in /var/www/mandje.php on line 114. This is the code I'm using:I'm trying to add some data to my database, but